A survey was taken on 30 classes at a school to find the total number of left-handed students in each class. The table below shows the results:

No. of left-handed students 0 1 2 3 4 5
Frequency (no. of classes) 1 2 5 12 8 2



A class was selected at random the probability that the class has at least 3 left-handed students

Asked by Topperlearning User | 9th Apr, 2014, 02:01: PM

Expert Answer:

Let A be the event of a class having at least 3 left-handed students.

n(A) = 12 + 8 + 2 = 22

P left parenthesis A right parenthesis equals 22 over 30 equals 11 over 15

Answered by  | 9th Apr, 2014, 04:01: PM